Kinetics of polyelectrolyte adsorption

Cohen Stuart MA, Hoogendam CV, de Keizer A (1997) Kinetics of polyelectrolyte adsorption. J Phys, Condens Matter 9 7767... 

The second part is devoted to adsorption of polyelectrolytes at interfaces and to flocculation and stabilization of particles in adsorbing polymer solutions. A recent theory of the electrostatic adsorption barrier, some typical experimental results, and new approaches for studying the kinetics of polyelectrolyte adsorption are presented in the first chapter of this part. In the following chapters, results are collected on the electrical and hydrodynamic properties of colloid-polyelectrolyte surface layers, giving information on the structure of adsorbed layers and their influence on the interactions between colloidal particles examples and mechanisms are analyzed of polyelectrolyte-induced stabilization and fragmentation of colloidal aggregates ... 

Cohen Stuart MA, Kleijn JM (2001) Kinetics of polyelectrolyte adsorption. In Radeva T (ed) Kinetics of polyelectrolyte adsOTptionedn. Marcel Dekker, New York... 

In the following seetions some systematie investigations of the kinetics of homo- and co-polymer adsorption are discussed. For the adsorption of neutral polymers the transport from the bulk to flie surface usually dominates the process. Exchange experiments with neufral polymers will help to unravel the mechanisms of attachment, detachment, and rearrangement. The kinetics of polyelectrolyte adsorption, and the kinetics of polymer adsorption on porous substrates are discussed in separate sections. 

Cohen-Stuart, M.A. Kinetics of polyelectrolyte adsorption. J. Phys. Cond. Matt. 9, 7767-7783 (1997)... 

Ringenbach, E., Chauveteau, G., and Pefferkom, E.. Effect of soluble aluminum ions on polyelectrolyte-alumina interaction. Kinetics of polymer adsorption and colloid stabilization. Colloids Surf. A, 99, 161, 1995. 

The kinetics of the adsorption of proteins onto the SPEB can be monitored by time-resolved SAXS. The uptake of protdns into the bmsh layer can be followed with high temporal and spatial resolution. Hence, one can localize the proteins within the bmsh at each stage of the adsorption. The uptake of BSA into the bmsh proceeds within 3 s, which is relativdy fast. However, a single protdn would need less than a millisecond to diffuse freely over a distance, which corresponds to the thickness of the polyelectrolyte layer. Thus the motion into the layer is slowed down by the dectrostatic repulsion among the like-charged protein molecules and the SPEB. The overall amount of adsorbed BSA scales with time as This was explained by a simple modd The protein undergoes a directed motion within the bmsh layer, which leads to a sub-diffusive behavior. 

This volume consists of four parts. The first part is devoted to theoretical studies and computer simulations. These studies deal with the structure and dynamics of polymers adsorbed at interfaces, equations of state for particles in polymer solutions, interactions in diblock copolymer micelles, and partitioning of biocolloidal particles in biphasic polymer solutions. The second part discusses experimental studies of polymers adsorbed at colloidal surfaces. These studies serve to elucidate the kinetics of polymer adsorption, the hydrodynamic properties of polymer-covered particles, and the configuration of the adsorbed chains. The third part deals with flocculation and stabilization of particles in adsorbing and nonadsorbing polymer solutions. Particular focus is placed on polyelectrolytes in adsorbing solutions, and on nonionic polymers in nonadsorbing solutions. In the final section of the book, the interactions of macromolecules with complex colloidal particles such as micelles, liposomes, and proteins are considered. 

Despite the recognized importance that presents the study of the adsorption kinetics, a small number of studies have been devoted of this topic [53, 96, 99, 100, 109, 119, 167]. Following a simple mathematical approach, it is possible to describe the adsorption kinetics of polyelectrolytes layers by the Raposo-Avrami model [168, 169],... 

Garg, A., Heflin, J.R., Gibson, H.W., Davis, R.M. Study of film structure and adsorption kinetics of polyelectrolyte multilayer films effect of pH and polymer concentration. Langmuir 24, 10887-10894 (2008)... 

Abstract Investigations of alternate adsorption regularities of cationic polyelectrolytes a) copolymer of styrene and dimethylaminopropyl-maleimide (CSDAPM) and b) poly(diallyldimethylammonium chloride) (PDADMAC) and anionic surfactant - sodium dodecyl sulfate (SDS) on fused quartz surface were carried out by capillary electrokinetic method. The adsorption/desorption kinetics, structure and properties of adsorbed layers for both polyelectrolytes and also for the second adsorbed layer were studied in dependence on different conditions molecular weight of polyelectrolyte, surfactant and polyelectrolyte concentration, the solution flow rate through the capillary during the adsorption, adsorbed layer formation... 

Kinetics of Layer-by-Layer Adsorption of Polyelectrolyte and Surfactant... 

Since the negative charged surface of fused quartz was used as a substrate, the first adsorbed layer was the layer of cationic polyelectrolyte. In our previous works [18-20] the adsorption kinetics of cationic polyelectrolyte CS-DAPM was studied in detail. The estimation of adsorption was carried out by changing of f potential of charged quartz surface during the cationic polyelectrolyte adsorption. 

Fig. 4 The adsorption kinetics of SDS with concentrations C = It) 4 M (curve 1) and C = 10 3 M (curve 2) on the quartz surface preliminary adsorbed by cationic polyelectrolyte CSDAPM C = 10-4 g/1...

We are not aware of theoretical predictions for the technologically most important high-salt regime. Still these results confirm charge reversal upon polyelectrolyte binding which has been observed in the fabrication of polyelectrolyte multilayers. It is also obvious that the complexity of electrostatic conditions at the interface and their change upon adsorption will cause complicated adsorption kinetics, as we have discussed above. 

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